Airtightness Testing

Airtightness Testing

Aldas are the most experienced Airtightness testers and consultants in the UK. We undertake bespoke and complex testing and leakage investigations, also thermographic inspections. For challenging and major projects requiring exceptional airtightness, Aldas will work with you to develop a solution.


Preliminary Tests

Acceptance Tests




Design Guidance



Aldas Coverage

Aldas have been involved in many interesting projects, both residential and commercial, big and small. We will always try to help where we can so please get in touch with us if your region is not covered by one of the testers.

Our Testing Team

Aldas is a collective of different people coming together to reliably deliver airtight buildings

Paul Jennings

Airtightness consultant. FOUNDER

Paul Jennings of Aldas is the most experienced airtightness tester and consultant in the UK, with over 30 years’ experience. 

Paul is an experienced trainer and originated the “Airtightness Champion” concept, as well as delivering numerous on-site trainings and many CPD seminars to architects and builders.  He developed the 12 Steps to Airtightness approach to enable UK contractors to reliably deliver airtightness in Passivhaus and other low-energy projects.

He has presented at many conferences and demonstrated test equipment at others. He has also given talks at Passivhaus conferences in Vancouver and Germany, as well as in the UK.  Paul has been involved in most UK Passivhaus projects in one or more capacities. He is also a Director of the UK Cohousing Network.

Get In Touch

Nic Schofield

North West

Airtightness Tester

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Matt Clarke

South West

Airtightness Tester

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Mike Neate

South East

Airtightness Tester

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Mischa Hewitt

South Coast

Airtightness Tester

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Registered with ATTMA

The Air Tightness Testing & Measurement Association (ATTMA) is a professional association dedicated to promoting technical excellence and commercial effectiveness in all air tightness testing applications. It was formed in 2002 to promote the testing and measurement industry and supports its members by extending market awareness of the technology and the members’ services.

Organisations we work with

Building bridges to a sustainable future

Home of Airtightness Champions

Please contact us so we can assist with all things related to Airtightness

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Nic Schofield

Nic is new to ALDAS, coming from a background of Ecology with a particular interest in biodiversity. She is an Ecology graduate with a long standing interest in the environment and human impact.

After planning out and embarking on a career path in Environmental science, baby number one came along. With baby number two and three came a change in career plans with a role within the NHS supporting parents, facilitating clinics and delivering antenatal classes with a particular focus on breastfeeding advocacy.

With a view to returning to Environmental science, she volunteered on an organic permaculture farm which reignited her passion for the environment. After nearly a decade discussing energy efficient construction with her husband Liam, she is looking forward to playing an active role in improving the energy efficiency of the UK’s housing stock.

In her spare time Nic gets covered in mud playing rugby for her local team, is attempting to find some muscles at the gym, loves walking her dog (even though she always claimed to be a cat person) likes growing vegetables and a bit of crochet.

Matt Clarke

Matt has been involved in sustainable building for over 10 years working with a variety of materials. He has led teams on straw bale builds and timber framed houses, collaborated on an Enerphit project and most recently on retrofitting projects.

He is a member of the AECB and completed their CarbonLite Retrofit Training course in 2021

Mike Neate

Mike Neate having initially studied architecture, has specialized for nearly two decades in project construction management of Low Energy Retrofit projects, particularly working on numerous  EnerPhit and Passsiv-Haus projects around the UK. Additionally Mike has worked as an Air-tightness contractor, and delivered on many Passiv-Haus and EnerPhit projects. Of which a number of these projects were accomplished while working alongside Paul Jennings and Aldas.

Alongside Air-tightness, architectural detailing & project management Mike also offers the role of Retrofit Coordinator and risk management.



Mischa Hewitt

As well as working with Aldas, Mischa is an energy consultant with Earthwise with a particular interest in affordable low energy buildings made from natural materials.  He has been working on domestic and commercial environmental buildings since 2003 and holds an MSc in Sustainable Architecture with Distinction from the Centre of Alternative Technology.

Mischa is a Certified Passivhaus Designer and Air Pressure Tester.  He is the co-author of the book Earthships in Europe and has written numerous articles on sustainable construction. Mischa is also a Trustee of the AECB – the Sustainable Building Association.